How to set WDTM2 while writing ACH to WDTE?

Question:

This concerns about the V850ES/Kx1. After writing "ACH" to the watchdog timer enable register (WDTE), is it possible to stop the operation of watchdog timer 2 by setting the watchdog mode timer mode register 2 (WDTM2)?

Answer:

Yes, that is possible.
The following description can be found in the Note 1 under the "12.2.1 Functions" in the User's Manual.

"Watchdog timer 2 automatically starts in the reset mode following reset release.
When watchdog timer 2 is not used, either stop its operation before reset is executed through this function, or clear once watchdog timer 2 and stop it within the next interval time".